Flow adjusting valve for combustion gas

ABSTRACT

A flow adjusting valve for combustion gas being provided with an air chamber between its air intake port and its air output port, the air chamber has an inlet connecting with the air intake port, and the air chamber is provided with a valve plug to block between the air intake port and the inlet, the valve plug is always kept at a position to close the inlet of the air chamber; when the electromagnetic device is electrically turned on, it generates a magnetic repulsion force against the permanent magnet to push the valve plug to open the inlet; when a transient pressure of combustion gas is larger than the magnetic repulsion force, the valve plug will close immediately, this can prevent the situation of gas leaking induced by overly large pressure of the gas supplied.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention is related to a technique for a gas combustionvalve, and especially to a flow adjusting valve for combustion gasadjusting by using magnetic attraction and magnetic repulsion forces.

2. Description of the Prior Art

An electromagnetic gas combustion valve of a normal utensil forcombustion gas (such as a gas stove or a gas combustion water heater) isprovided on a flow path of the vale itself with a vale plug set, thevale plug set includes a valve plug at an air intake port, a springabutting against the vale plug, an iron sheet connecting with the valeplug and an electromagnetic device that can generate magnetic attractionforce on the iron sheet after electrically turning on.

When the electromagnetic device has not yet been electrically turned on,the vale plug is kept at the position to close the air intake port underthe abutting force of the spring; when the electromagnetic device iselectrically turned on, it generates magnetic attraction force toattract the iron sheet to displace the vale plug and to open theelectromagnetic device, and the spring is given with an elasticrestoring force; and when the electromagnetic device stops action, thespring makes the vale plug restore its original position to close theair intake port under the abutting action of the restoring force of thespring.

The above conventional electromagnetic gas combustion valve has thefollowing defects:

-   1. The state of opening/closing between the vale plug and the air    intake port is decided by whether the electromagnetic device    generates a magnetic attraction force after being electrically    turned on, thereby it can only control the on/off action, the    adjusting of flow needs an additional flow adjusting mechanism to    control.-   2. Closing of the air intake port by the vale plug is effected under    the abutting action of the restoring force of the spring, if the    spring is overly frequently used, a problem of elastic fatigue may    occur to make the valve plug untightly close the air intake port.-   3. If the air intake port has overly large transient pressure of    combustion gas (especially when using natural gas) under the state    of being closed by the vale plug, the plunger of the vale plug will    be pushed away from the air intake port by the overly large pressure    to induce leaking of the combustion gas.-   4. If the transient pressure of combustion gas is overly large under    the state of opening of the air intake port, overly large transient    supplying amount of the combustion gas may be induced, burning fire    on the stove may have a phenomenon of bursting combustion.

In view of the above problems resided in the prior art, the inventor ofthe present invention designed and provided the present invention “aflow adjusting valve for combustion gas” to solve the defects resided inthe above conventional gas combustion valve.

SUMMARY OF THE INVENTION

The main object of the present invention is to provide a flow adjustingvalve for combustion gas for adjusting the degree of opening between avalve plug and an air intake port by controlling the magnitude ofmagnetic repulsion force of an electromagnetic device; and when thetransient pressure of combustion gas is larger than the magneticrepulsion force, the valve plug will close immediately, this can preventthe situation of gas leaking induced by overly large pressure of the gassupplied.

In order to achieve the object, the present invention is provided on theflow adjusting valve for combustion gas with the air intake port forentering of combustion gas, an air chamber connecting with the airintake port and an air output port connecting with the air chamber forreleasing the combustion gas.

Wherein:

the air chamber has an inlet connecting with the air intake port, andthe air chamber is provided with the valve plug having a diameter largerthan that of the inlet to block between the air intake port and theinlet, the bottom of the valve plug is connected with a valve rod ofwhich the bottom is extended to the tailing end of the air chamber, thebottom of the valve rod is provided with an air tight elastic diagramfor sealing the bottom of the air chamber, the air tight elastic diagramis provided thereon with a permanent magnet; the air chamber is providedoutside of it with the electromagnetic device that is in cooperationwith the permanent magnet.

When the electromagnetic device is not operated, a magnetic attractionforce is generated between the electromagnetic device and an iron coreof the electromagnetic device, through the valve rod, the magneticattraction force always keeps the position of the valve plug at theinlet to close the air chamber; when the electromagnetic device iselectrically turned on, it generates a magnetic repulsion force againstthe permanent magnet to push the valve plug and the valve rod to openthe inlet, thereby the combustion gas can be released from the airoutput port after it enters the air chamber from the air output port andthe inlet sequentially, and thereby the degree of opening between thevalve plug and the air inlet can be adjusted by controlling themagnitude of magnetic repulsion force generated by the electromagneticdevice.

In comparison with the prior art, the present invention not only canadjust the magnitude of flow of the combustion gas, but also can makevery tight sealing when the valve plug closes the inlet, because thevalve plug is provided between the air intake port and the inlet, andthe larger the pressure at the air intake port is, the larger the forceof abutting of the valve plug against the inlet will be; therefore, thevalve plug will not be pushed away to make air leaking.

And more, under the state that the valve plug opens the inlet by themagnetic repulsion force, when the transient pressure of combustion gasis larger than the magnetic repulsion force, the valve plug will abutagainst the inlet immediately, this can prevent the situation ofbursting combustion of burning fire on a stove by overly large pressureof the gas supplied.

The present invention will be apparent in its mode of operationaccording to its technical measures after reading the detaileddescription of the preferred embodiment thereof in reference to theaccompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional schematic view showing the structure of a firstembodiment of the present invention;

FIG. 2 is a sectional schematic view anatomically showing the firstembodiment of the present invention;

FIG. 3 is an anatomic perspective view of the first embodiment of thepresent invention;

FIG. 4 is a perspective view showing the appearance of the firstembodiment of the present invention;

FIG. 5 is a sectional view of a second embodiment of the presentinvention after assembling;

FIG. 6 is a sectional schematic view anatomically showing the secondembodiment of the present invention;

FIG. 7 is a perspective schematic view showing serially connecting ofthe second embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

FIG. 1 shows a first embodiment of a flow adjusting valve for combustiongas of the present invention, in this embodiment, the flow control valvefor combustion gas is provided with an air intake port 10 for enteringof combustion gas, an air chamber 20 connecting with the air intake port10 and an air output port 30 connecting with the air chamber 20 forreleasing the combustion gas.

Wherein: the air chamber 20 has an inlet 21 connecting with the airintake port 10, and the air chamber 20 is provided with a valve plug 40having a diameter larger than that of the inlet 21 to block between theair intake port 10 and the inlet 21, the bottom of the valve plug 40 isconnected with a valve rod 50 of which the bottom is extended to thetailing end of the air chamber 20, the bottom of the valve rod 50 isprovided with an air tight elastic diagram 60 for sealing the bottom ofthe air chamber 20, the air tight elastic diagram 60 is provided thereonwith a permanent magnet 70; the air chamber 20 is provided outside of itwith the electromagnetic device 80 that is in cooperation with thepermanent magnet 70.

The electromagnetic device 80 further includes an iron core 81 and a setof coil 82 wound about the iron core 81, the coil 82 can make the ironcore 81 generate magnetic poles of different strengths in pursuance ofthe magnitudes of electric fluxes, the magnetic poles correspond withthe permanent magnet 70 and are of the same magnetic poles as that of anopposite surface of the latter, thereby the electromagnetic device 80will generate a magnetic repulsion force against the permanent magnet70.

With the above structure, the permanent magnet 70 will generate amagnetic attraction force because of the iron core 81 of theelectromagnetic device 80 when the electromagnetic device is notoperated to make the permanent magnet 70 keep an action force toward theelectromagnetic device 80, the action force is acted on the valve plug40 through the valve rod 50, so that the valve plug 40 is always kept atthe position to close the inlet 21 of the air chamber 20.

By virtue that the valve plug 40 is provided between the air intake port10 and the inlet 21, the valve plug 40 has a diameter larger than thatof the inlet 21, under the state that the valve plug 40 closes the inlet21, the larger the pressure at the air intake port 10 is, the larger theforce of abutting of the valve plug 40 against the inlet 21 will be,tighter closing can be effected, therefore, the valve plug 40 will notbe pushed away to make a state of air leaking.

When the electromagnetic device 80 is electrically turned on, as ismentioned above, it generates a magnetic repulsion force against thepermanent magnet 70 to push the valve rod 50 and the valve plug 40 toopen the inlet 21, thereby the combustion gas can be released from theair output port 30 after it enters the air chamber 20 from the airoutput port 10 and the inlet 21 sequentially; and by virtue that thecoil 82 can make the iron core 81 generate magnetic poles of differentstrengths in pursuance of the magnitudes of electric fluxes as statedabove, thereby the degree of opening between the valve plug 40 and theair inlet 21 can be adjusted by controlling the magnitude of magneticrepulsion force generated by the electromagnetic device 80.

And more, under the state that the valve plug 40 opens the inlet 21 bythe magnetic repulsion force, when the transient pressure of combustiongas at the air intake port 10 is larger than the magnetic repulsionforce, the valve plug 40 will abut against the inlet 21 immediately,this can prevent the situation of bursting combustion of burning fire ona stove by overly large pressure of the gas supplied.

When in practicing, the bottom of the iron core 81 can be exposed to theoutside of the electromagnetic device 80, for the convenience ofadjusting the distance between the iron core 81 from the permanentmagnet 70 to thereby adjust the magnitude of the magnetic repulsionforce or the magnetic attraction force between the iron core 81 and thepermanent magnet 70.

As shown in FIGS. 2 and 3, when in practicing of the present invention,the air intake port 10 and the air output port 30 can be provided on anupper housing 90, the upper housing 90 is provided between the airintake port 10 and the air output port 30 with an engaging port 91 toengage with a lower housing 92, the air chamber 20 is provided on thelower housing 92 and extends through the latter, in order that the inlet21 is on the top of the lower housing 92, the air tight elastic diagram60 is on the bottom of the lower housing 92 to seal the air chamber 20,the permanent magnet 70 is provided beneath the air tight elasticdiagram 60, while the electromagnetic device 80 can be fixed below thelower housing 92 in opposition to the permanent magnet 70.

Moreover, the valve rod 50 further has an elastic element 51 whichconstantly pushes the valve plug 40 to keep the latter at the positionto close the air intake port, thereby to help the valve plug 40 to closethe inlet 21 more tightly; other advantages resided in the presentinvention are that, the air chamber 20, the valve plug 40, the valve rod50, the air tight elastic diagram 60 and the permanent magnet 70 aremounted in advance on the lower housing 92, and after connecting of thelower housing 92 with the upper housing 90, the electromagnetic device80 is fixed below the lower housing 92, this is superior in convenientassembling, the appearance after assembling is shown in FIG. 4.

FIGS. 5 and 6 are sectional schematic views showing the structure of thesecond embodiment of the present invention, in which an air intake port10, an air chamber 20, an air output port 30, a valve plug 40, a valverod 50, an air tight elastic diagram 60, a permanent magnet 70 and aelectromagnetic device 80 etc. are depicted, the way and principle ofaction of them are same as those of the first embodiment, and no furthernarration is necessary here; besides, the position relations of thefollowing members are same as those of the first embodiment too, i.e.:the intake port 10 is provided on the upper housing 90 which further hasan engaging port 91 to engage with a lower housing 92, the air chamber20 is provided on the lower housing 92 and extends through the latter,in order that the inlet 21 is on the top of the lower housing 92, theair tight elastic diagram 60 is on the bottom of the lower housing 92etc. The flow path of the combustion gas therein still is in thesequence from the air intake port 10, the inlet 21, the air chamber 20to the air output port 30, and then the combustion gas is releasedoutsides.

The difference of the second embodiment from the first embodiment isresided in that, the air output port 30 is provided on the lower housing92 to communicate with the air chamber 20, the upper housing 90 isfurther provided with a serially connecting port 94 in communicationwith the air intake port 10. The object that the second embodiment isfurther provided with the serially connecting port 94 just as shown inFIG. 7, when the present invention is used on a system having aplurality of stoves and needs to serially connect a plurality of flowadjusting valves for combustion gas, by the fact that the air intakeport 10 is communicated directly with the serially connecting port 94,the serially connecting port 94 can be used to serially connect acombustion gas inlet of some combustion gas valve 100.

The second embodiment still has the advantages of the first embodimentin assembling.

The preferred embodiments shown and described are only for illustratingthe present invention, and not for giving any limitation to the scope ofthe present invention; it will be apparent to those skilled in this artthat various modifications or changes without departing from the spiritof this invention shall also fall within the scope of the appendedclaims.

1. A flow adjusting valve for combustion gas being provided with an airintake port for entering of combustion gas, an air chamber connectingwith said air intake port and an air output port connecting with saidair chamber for releasing said combustion gas, wherein: said air chamberhas an inlet connecting with said air intake port, and said air chamberis provided with a valve plug having a diameter larger than that of saidinlet to block between said air intake port and said inlet, a bottom ofsaid valve plug is connected with a valve rod of which a bottom isextended to a tailing end of said air chamber, said bottom of said valverod is provided with an air tight elastic diagram for sealing a bottomof said air chamber, said air tight elastic diagram is provided thereonwith a permanent magnet; said air chamber is provided outside of it withan electromagnetic device that is in cooperation with said permanentmagnet; when said electromagnetic device is not operated, a magneticattraction force is generated between said electromagnetic device and aniron core of said electromagnetic device, said valve plug is always keptat a position to close said inlet of said air chamber; when saidelectromagnetic device is electrically turned on, it generates amagnetic repulsion force against said permanent magnet to push saidvalve plug and said valve rod to open said inlet, thereby saidcombustion gas is released from said air output port after it enterssaid air chamber from said air output port and said inlet sequentially,and thereby degree of opening between said valve plug and said air inletis adapted to being adjusted by controlling magnitude of said magneticrepulsion force generated by said electromagnetic device.
 2. The flowadjusting valve for combustion gas as in claim 1, wherein said airintake port and said air output port are provided on an upper housing,said upper housing is provided between said air intake port and said airoutput port with an engaging port to engage with a lower housing, saidair chamber is provided on said lower housing and extends through thelatter, in order that said inlet is on a top of said lower housing, saidair tight elastic diagram is on a bottom of said lower housing.
 3. Theflow adjusting valve for combustion gas as in claim 1, wherein said airintake port is provided on an upper housing, said upper housing isprovided with an engaging port to engage with a lower housing, said airchamber is provided on said lower housing and extends through thelatter, in order that said inlet is on a top of said lower housing, saidair tight elastic diagram is on a bottom of said lower housing, and saidair output port is provided on said lower housing to communicate withsaid air chamber.
 4. The flow adjusting valve for combustion gas as inclaim 3, wherein said upper housing is further provided with a seriallyconnecting port in communication with said air intake port, to be usedto serially connect a combustion gas inlet of another flow adjustingvalve for combustion gas.
 5. The flow adjusting valve for combustion gasas in claim 1, wherein said valve rod further has an elastic elementwhich pushes said valve plug to keep the latter at a position to closesaid inlet.
 6. The flow adjusting valve for combustion gas as in claim1, wherein said electromagnetic device further includes an iron core anda coil wound about said iron core, said coil makes said iron coregenerate magnetic poles of different strengths in pursuance of themagnitudes of electric fluxes.
 7. The flow adjusting valve forcombustion gas as in claim 6, wherein a bottom of said iron core isexposed to outside of said electromagnetic device for adjusting distancebetween said iron core from said permanent magnet.